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18 Dec 2019

a particular sample of zinc-aluminum alloy weighs 3.00 g and has mass percentages of 73.5% Zn and 26.5% Al.
a. how many moles of each element is in the alloy sample?
b. how many theoretical moles of H2 (g) will be produced by the reaction of HCl aq with each metal and what will be the total number of moles produced?

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Related questions

A 0.250-g sample of a magnesium-aluminum alloy dissolves completely in an excess of HCl(aq). When the liberated H2(g) is collected over water at 29 รขยˆย˜C and 752 torr, the volume is found to be 345 mL . The vapor pressure of water at 29 รขยˆย˜C is 30.0 torr. A) How many moles of H2 can be produced from x grams of Mg in magnesium-aluminum alloy? The molar mass of Mg is 24.31 g/mol. B) How many moles of H2 can be produced from y grams of Al in magnesium-aluminum alloy? The molar mass of Al is 26.98 g/mol.

A 0.250-g sample of a magnesium-aluminum alloy dissolvescompletely in an excess of HCl(aq). When the liberated H2(g) iscollected over water at 29 ?C and 752 torr, the volume is found tobe 313mL . The vapor pressure of water at 29 ?C is 30.0 torr.

How many moles of H2 can be produced from y grams of Al inmagnesium-aluminum alloy? The molar mass of Al is 26.98 g/mol.

Gases

1. In atypical experiment, you drop a gelatin capsule containing 0.1458 gof an Al-Zn alloy sample into an HCl solution.

a) Writethe equations that represent the chemical reactions that take placeafter the capsule has dissolved in HCl? (4pts)

b) Whichgas is liberated and how is it collected? (4pts)

c)Sketch an apparatus for the gas collection and explain all parts ofyour drawing. (4pts)

2. Whenusing 0.1458 g of the Al-Zn alloy, 152.61 mL of water are beingdisplaced at temperature of 298K and a barometric pressure of 756mmHg.

(PH2O at298K= 23.8 mmHg; R= 0.0821 atm L /(mol K)

a) Findthe number of moles of H2 evolved, nH2 (7pts)

b) FindNH2 , the number of moles of H2 per gram of sample. (3pts)

c) Findthe % Al in the sample: (2pts)

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